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<p>The QDesignerCustomWidgetCollectionInterface class allows you to include several custom widgets in one single library. <a href="#details">More...</a></p>
<pre> #include &lt;QDesignerCustomWidgetCollectionInterface&gt;</pre><ul>
<li><a href="qdesignercustomwidgetcollectioninterface-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h3>Public Functions</h3>
<ul>
<li><div class="fn"/>virtual <b><a href="qdesignercustomwidgetcollectioninterface.html#dtor.QDesignerCustomWidgetCollectionInterface">~QDesignerCustomWidgetCollectionInterface</a></b> ()</li>
<li><div class="fn"/>virtual QList&lt;QDesignerCustomWidgetInterface *&gt; <b><a href="qdesignercustomwidgetcollectioninterface.html#customWidgets">customWidgets</a></b> () const = 0</li>
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<a name="details"></a>
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<h2>Detailed Description</h2>
<p>The QDesignerCustomWidgetCollectionInterface class allows you to include several custom widgets in one single library.</p>
<p>When implementing a custom widget plugin, you build it as a separate library. If you want to include several custom widget plugins in the same library, you must in addition subclass QDesignerCustomWidgetCollectionInterface.</p>
<p>QDesignerCustomWidgetCollectionInterface contains one single function returning a list of the collection's <a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a> objects. For example, if you have several custom widgets <tt>CustomWidgetOne</tt>, <tt>CustomWidgetTwo</tt> and <tt>CustomWidgetThree</tt>, the class definition may look like this:</p>
<pre> #include customwidgetoneinterface.h
 #include customwidgettwointerface.h
 #include customwidgetthreeinterface.h

 #include &lt;QtDesigner/QtDesigner&gt;
 #include &lt;QtCore/qplugin.h&gt;

 class MyCustomWidgets: public QObject, public QDesignerCustomWidgetCollectionInterface
 {
     Q_OBJECT
     Q_INTERFACES(QDesignerCustomWidgetCollectionInterface)

 public:
     MyCustomWidgets(QObject *parent = 0);

     virtual QList&lt;QDesignerCustomWidgetInterface*&gt; customWidgets() const;

 private:
     QList&lt;QDesignerCustomWidgetInterface*&gt; widgets;
 };</pre>
<p>In the class constructor you add the interfaces to your custom widgets to the list which you return in the <a href="qdesignercustomwidgetcollectioninterface.html#customWidgets">customWidgets</a>() function:</p>
<pre> MyCustomWidgets::MyCustomWidgets(QObject *parent)
         : QObject(parent)
 {
     widgets.append(new CustomWidgetOneInterface(this));
     widgets.append(new CustomWidgetTwoInterface(this));
     widgets.append(new CustomWidgetThreeInterface(this));
 }

 QList&lt;QDesignerCustomWidgetInterface*&gt; MyCustomWidgets::customWidgets() const
 {
     return widgets;
 }

 Q_EXPORT_PLUGIN2(MyCustomWidgets)</pre>
<p>Note that instead of exporting each custom widget plugin using the <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>() macro, you export the entire collection. The <a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>() macro ensures that <i>Qt Designer</i> can access and construct the custom widgets. Without this macro, there is no way for <i>Qt Designer</i> to use them.</p>
<p>See also <a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a> and <a href="designer-creating-custom-widgets.html">Creating Custom Widgets for Qt Designer</a>.</p>
<hr />
<h2>Member Function Documentation</h2>
<h3 class="fn"><a name="dtor.QDesignerCustomWidgetCollectionInterface"></a>QDesignerCustomWidgetCollectionInterface::~QDesignerCustomWidgetCollectionInterface ()&nbsp;&nbsp;<tt> [virtual]</tt></h3>
<p>Destroys the custom widget collection interface.</p>
<h3 class="fn"><a name="customWidgets"></a><a href="qlist.html">QList</a>&lt;<a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a> *&gt; QDesignerCustomWidgetCollectionInterface::customWidgets () const&nbsp;&nbsp;<tt> [pure virtual]</tt></h3>
<p>Returns a list of interfaces to the collection's custom widgets.</p>
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